Small, but perfectly formed, the R6 Rescue craft is an unusual little craft in many respects. While a lot of the second series Spacex toys were considerable larger than the originals, the R6 is probably one of the smallest across both ranges. That said, it has a lot going on, including a detachable fuel tank and spring launched escape pod. The only failing for me was the previously discussed Airfix Saturn V J2 engine which had been used on the back.
The mystifying card back shows a completely different engine and a kind of sphere, neither of which feature with the released model. For a rescue ship, it is very diminuitive, so I got to thinking if it would have a larger booster section for long haul trips. With this in mind, I recently scored a Rosenthal 'Macs Car' turbine part on ebay and due to its size, was immediately put in mind of a standalone spaceship.
My original R6 was really play worn and dilapidated, so I decided to take the ridiculous Airfix engine part off and replace it with something more reminiscent of the card back. Then, I took the intake off the turbine and reversed it. A Multimac cabin part, complete with small golden astronaut pilot, sat on the back completed the ensemble. It still needs a little work to clean and complete the project, but overall I am happy with the piece and it is only minimally held together should I change my mind!